Outdoor advertising sign



FIG. 1 is a perspective view of an outdoor advertising sign, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left end elevational view thereof;

FIG. 4 is a right end elevational view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a bottom view thereof. 

The ornamental design for an outdoor advertising sign, as shown and described. 